Short-circuit protection assembly and photovoltaic inverter system

Abstract

The utility model discloses a short-circuit protection assembly and a photovoltaic inverter system, the short-circuit protection assembly comprises a pedestal, the pedestal is provided with a first interface, a second interface and an opening, the first interface is hermetically provided with a first connector used for being electrically connected with a cathode of a photovoltaic assembly, and the second interface is hermetically provided with a second connector used for being electrically connected with an anode of the photovoltaic assembly; the second interface is provided with a second connector used for being electrically connected with the negative input end of the inverter in a sealed mode. The heat dissipation cover plate covers the opening and is in sealed connection with the base to form a sealed cavity; the protection assembly is arranged in the sealing cavity and abuts against the heat dissipation cover plate; the first end and the second end of the protection assembly are electrically connected with the first connector and the second connector in a one-to-one mode, and the current direction of the protection assembly flows from the second end to the first end. According to the technical scheme of the utility model, the inverter can be protected when the non-isolated string type photovoltaic inverter is short-circuited to the ground.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic-to-ground short-circuit protection, in particular to a short-circuit protection component and a photovoltaic inverter system. Background Art

[0002] With the increasing application of photovoltaic (PV) renewable energy, the safety of PV power plants and the stability of PV inverters are receiving increasing attention. Traditionally, insulation impedance testing is used to troubleshoot grounding anomalies at the PV module end. However, this insulation impedance testing function fails when some types of inverters (such as non-isolated string PV inverters) are connected to the grid for grid-connected operation. Therefore, a short-circuit to ground can easily short-circuit the grid through the inverter, ultimately causing inverter failure. Utility Model Content

[0003] The main purpose of the utility model is to provide a short-circuit protection component, which aims to solve the problem that when the insulation impedance detection function fails and a short-circuit fault to ground occurs, the inverter failure is easily caused.

[0004] To achieve the above-mentioned purpose, the present invention provides a short-circuit protection component, which includes:

[0005] A base, the base having a first interface, a second interface, and an opening, the first interface being sealed with a first connector for electrically connecting to the negative pole of the photovoltaic module, and the second interface being sealed with a second connector for electrically connecting to the negative input terminal of the inverter;

[0006] a heat dissipation cover plate, covering the opening and sealingly connected to the base to form a sealed cavity;

[0007] A protection component is arranged in the sealed cavity and abuts against the heat dissipation cover; the first end and the second end of the protection component are electrically connected to the first connector and the second connector one-to-one, and the current direction of the protection component is from the second end to the first end.

[0008] Optionally, the base has a first side wall and a second side wall that are opposite to each other in a first preset direction, the first interface is provided on the first side wall, the second interface is provided on the second side wall, and the first interface and the second interface are arranged opposite each other;

[0009] The protection component is located between the first interface and the second interface.

[0010] Optionally, the base further has a third side wall and a fourth side wall opposite to each other in a second preset direction, and the second preset direction is perpendicular to the first preset direction;

[0011] A first fixing portion is provided on the outer side of the third side wall, and a second fixing portion is provided on the outer side surface of the fourth side wall.

[0012] Optionally, the base further has a bottom end facing the heat dissipation cover plate;

[0013] The first fixing portion and the second fixing portion are respectively flush with the outer side surface of the bottom end.

[0014] Optionally, the first interface, the second interface, and the protection component are all multiple in number;

[0015] All the first interfaces are provided on the first side wall and are arranged sequentially along the second preset direction; each of the first interfaces is sealed with a first connector for electrically connecting to the negative pole of the photovoltaic module;

[0016] All the second interfaces are provided on the second side wall and are arranged in sequence along the second preset direction; each second interface seal is provided with a second connector for electrically connecting to the negative input terminal of the inverter;

[0017] All the protection components are respectively in contact with the heat dissipation cover plate; the first ends of the plurality of protection components are electrically connected to the plurality of first connectors in a one-to-one manner, and the second ends of the plurality of protection components are electrically connected to the plurality of second connectors in a one-to-one manner;

[0018] All the first interfaces are respectively arranged opposite to different second interfaces, and each of the protection components is arranged between the connected first connector and the second connector.

[0019] Optionally, the short-circuit protection component includes:

[0020] A first heat exchange component is sandwiched between the protection component and the heat dissipation cover plate.

[0021] Optionally, a projected area of ​​the first heat exchange element on the heat dissipation cover plate is larger than a projected area of ​​the protection component on the heat dissipation cover plate.

[0022] Optionally, the short-circuit protection component includes:

[0023] The buckle has a first end and a second end opposite to each other, the first end of the buckle is connected to the heat dissipation cover plate, the second end of the buckle is connected to an extension portion, the extension portion forms a snap-fit ​​space, and the protection component is snap-fitted into the snap-fit ​​space.

[0024] Optionally, a second heat exchange component is provided in the buckle.

[0025] The present invention also provides a photovoltaic inverter system, which includes:

[0026] Photovoltaic panels;

[0027] inverter; and,

[0028] As the short-circuit protection component mentioned above, the short-circuit protection component is connected to the negative electrode of the photovoltaic component and the negative input terminal of the short-circuit protection component respectively.

[0029] In this embodiment, when a current flows from the negative electrode of the photovoltaic module to the negative input terminal of the inverter, the short-circuit protection component can disconnect the current transmission path between the negative electrode of the photovoltaic module and the negative input terminal of the inverter through the protection component to prevent the current from flowing to the inverter, thereby disconnecting the short-circuit loop to ground formed by the negative electrode of the photovoltaic module and the inverter, thereby solving the problem of the body diode exploding under the action of this current and causing inverter failure. In addition, the technical solution of the utility model reuses the heat dissipation cover plate as the cover plate of the base and the heat dissipation device of the protection component, thereby eliminating the need to set up an additional heat dissipation device for the protection component in the sealed cavity. This not only reduces the cost of the short-circuit protection component, but also helps save space in the sealed cavity to achieve a miniaturized design of the short-circuit protection component. Moreover, since the protection component is in the sealed cavity, the short-circuit protection component as a whole also has good waterproof capabilities, making it more convenient to use in outdoor scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 This is a structural diagram of an embodiment of a short-circuit protection assembly of the present utility model;

[0032] Figure 2 This is an exploded view of an embodiment of a short-circuit protection assembly of the present invention;

[0033] Figure 3 A top view of an embodiment of a short-circuit protection assembly of the present invention;

[0034] Figure 4 This is a structural diagram of another embodiment of the short-circuit protection component of the utility model;

[0035] Figure 5 An exploded view of an embodiment of a short-circuit protection assembly of the present invention from another perspective;

[0036] Figure 6 This is a cross-sectional view of an embodiment of a short-circuit protection assembly of the present invention;

[0037] Figure 7 This is a schematic diagram of the current flow in a traditional photovoltaic inverter circuit when a short circuit to ground occurs at the negative pole of a photovoltaic module;

[0038] Figure 8 This is a circuit diagram of a protection component in an embodiment of a short-circuit protection component of the present invention;

[0039] Figure 9 FIG. 1 is a circuit diagram of a protection component in another embodiment of the short-circuit protection component of the present invention.

[0040] Description of Figure Numbers:

[0041]

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0045] The utility model provides a short circuit protection component.

[0046] Reference Figures 1 to 6 In one embodiment, the short circuit protection component includes:

[0047] The base 10 is provided with a first interface 11, a second interface 12, and an opening 13. The first interface 11 is sealed with a first connector 111 for electrically connecting to the negative pole of the photovoltaic module, and the second interface 12 is sealed with a second connector 121 for electrically connecting to the negative input terminal of the inverter;

[0048] a heat dissipation cover plate 20 , which covers the opening 13 and is sealed to the base to form a sealed cavity;

[0049] The protection component 30 is arranged in the sealed cavity and abuts against the heat dissipation cover 20; the first end and the second end of the protection component 30 are electrically connected one-to-one with the first connector 111 and the second connector, and the current direction of the protection component 30 is from the second end to the first end.

[0050] In this embodiment, the first interface 11 and the first connector 111, the second interface 12, and the second connector 121 can be connected using sealed threaded connections, wherein nuts can be provided in the sealed cavity corresponding to the first interface 11 and the second interface 12, respectively, and the first connector 111 and the second connector 121 can be provided with corresponding male threads. The head ends of the first connector 111 and the second connector 121 can pass through the first interface 11 and the second interface 12, respectively, and be located in the cavity of the base 10. The tail end of the first connector 111 can be connected to the negative terminal of the photovoltaic module via a cable, and the tail end of the second connector 121 can be connected to the negative input terminal of an inverter (e.g., a non-isolated string photovoltaic inverter) via a cable.

[0051] The shape of the heat dissipation cover plate 20 can match the opening 13 of the base 10, so that it can be placed over the opening 13 and enclose the base 10 to form a sealed cavity. A waterproof gasket or waterproof glue can be provided between the heat dissipation cover plate 20 and the opening 13 to achieve a sealed connection between the heat dissipation cover plate 20 and the base 10. The sealing method between the heat dissipation cover plate 20 and the opening 13 is not limited in this embodiment, as long as a sealed connection between the two is achieved.

[0052] Figure 8 and Figure 9 The embodiment of the protection component 30 is shown respectively. Of course, the embodiment of the protection component 30 is not limited to Figure 8 and Figure 9 Both of the two implementation methods are acceptable as long as they can promptly disconnect the current path when a short-circuit current occurs between the negative pole of the PV module and the negative input terminal of the inverter.

[0053] Reference Figure 8 The protection component 30 may be a diode D1, and the anode and cathode of the diode D1 may correspond to the second end and the first end of the protection component 30. The first end of the protection component 30 may be electrically connected to the head end of the first connector 111 via a conductive member such as a wire or a metal member, and the second end of the protection component 30 may be electrically connected to the head end of the second connector 121 via a conductive member such as a wire or a metal member.

[0054] Reference Figure 9The protection component 30 may include a switch circuit 31 and a drive circuit 32. The first end of the switch circuit 31 is connected to the negative input end of the inverter, and the second end is connected to the negative pole of the photovoltaic module. The detection end of the drive circuit 32 is connected to the negative input end of the inverter or the negative pole of the photovoltaic module, and the control end of the drive circuit 32 is connected to the controlled end of the switch circuit 31. The drive circuit 32 is used to drive the switch circuit 31 to connect the negative input end of the inverter and the negative pole of the photovoltaic module when it detects that the current direction at the detection end is the same as the preset current direction; and to drive the switch circuit 31 to disconnect the negative input end of the inverter from the negative pole of the photovoltaic module when the current direction at the detection end is different from the preset current direction. The preset current direction is from the negative input end of the inverter to the negative pole of the photovoltaic module.

[0055] Specifically, the switch circuit 31 can be composed of switching devices such as transistors, MOS transistors, IGBTs, optocouplers, and relays. The drive circuit 32 can be composed of a main controller and a resistor device. The main controller can be implemented using an MCU, FPGA, DSP, or CPU main control chip. The resistor device constitutes the detection end of the drive circuit 32 and can be located between the negative input of the inverter and the switch circuit 31, or between the switch circuit 31 and the negative electrode of the photovoltaic module. The main controller can obtain the voltage value across the resistor device to determine the direction of the current flowing from the negative input of the inverter to the negative electrode of the photovoltaic module. Here, the trigger logic of the switch circuit 31 is described by taking the resistor device located between the negative input of the inverter and the switch circuit 31 as an example. The end of the resistor device connected to the switch circuit 31 is set as the first end, and the end connected to the negative input of the inverter is set as the second end. If the main controller detects that the voltage value at the second end of the resistor device is greater than that at the first end, it indicates that the current is flowing from the inverter negative input terminal to the negative electrode of the photovoltaic module, that is, no short circuit to ground fault has occurred at this time, and the switch circuit 31 is kept on to connect the inverter negative input terminal and the negative electrode of the photovoltaic module. If the main controller detects that the voltage value at the second end of the resistor device is less than that at the first end, it indicates that the current is flowing from the photovoltaic module to the negative inverter negative input terminal, that is, a short circuit to ground fault has occurred at this time, and the switch circuit 31 is driven to turn off to disconnect the negative input terminal of the inverter and the negative electrode of the photovoltaic module.

[0056] It is understandable that the inverter has IGBTs, Figure 7 The embodiment shown shows an inverter circuit constructed using IGBT ( Figure 2 QA1~QA4, QB1~QB4, QC1~QC4 are all IGBTs). Since IGBTs have body diodes and their circuit structure is non-isolated, once a short-circuit fault occurs to the ground in the non-isolated string-type photovoltaic inverter during grid-connected operation, the grid will be short-circuited through the body diodes (caused by Figure 2As can be seen from the current path shown, the short-circuit current will pass through the body diode of the IGBT, eventually causing the IGBT to explode and the inverter to fail.

[0057] It should be noted that when the negative pole of the photovoltaic module is not short-circuited to the ground, the current direction between the negative pole of the photovoltaic module and the negative input terminal of the inverter is from the negative input terminal of the inverter to the negative pole of the photovoltaic module. At this time, no short-circuit loop to the ground is formed between the photovoltaic module and the inverter. When a short-circuit to the ground occurs, such as Figure 7 As shown, the current direction is opposite, that is, the current direction between the negative electrode of the photovoltaic module and the negative input terminal of the inverter is from the negative electrode of the photovoltaic module to the negative input terminal of the inverter.

[0058] In this embodiment, when current flows from the negative terminal of the photovoltaic module to the negative input terminal of the inverter, the short-circuit protection component disconnects the current transmission path between the negative terminal of the photovoltaic module and the negative input terminal of the inverter via the protection component 30, thereby preventing the current from flowing to the inverter. This disconnects the short-circuit loop to ground formed by the negative terminal of the photovoltaic module and the inverter, thereby resolving the issue of the body diode bursting under the influence of this current, leading to inverter failure. It is understood that when current flows from the negative input terminal of the inverter to the negative terminal of the photovoltaic module, the short-circuit protection component does not disconnect the current transmission path between the two terminals, allowing the current to flow normally through the protection component 30 to the negative terminal of the photovoltaic module, thereby forming a normal current loop.

[0059] The heat dissipation cover 20 can dissipate the heat generated by the protection component 30 when the current flows through the protection component 30. Figures 1 to 6 In the illustrated embodiment, the heat dissipation cover plate 20 may also be provided with heat dissipation teeth 21 on the outer end surface facing away from the sealed cavity to improve heat dissipation efficiency. By reusing the heat dissipation cover plate 20 as the cover plate for the base 10 and the heat dissipation device for the protection assembly 30, there is no need to provide an additional heat dissipation device for the protection assembly 30 within the sealed cavity. This not only reduces the cost of the short-circuit protection assembly, but also helps save space in the sealed cavity, thereby achieving a miniaturized design of the short-circuit protection assembly. Furthermore, since the protection assembly 30 is located within the sealed cavity, the short-circuit protection assembly as a whole also has good waterproof capabilities, making it more convenient for use in outdoor scenarios.

[0060] Reference Figure 3 The base 10 has a first side wall 14 and a second side wall 15 that are opposite to each other in a first preset direction S1. The first interface 11 is provided on the first side wall 14, and the second interface 12 is provided on the second side wall 15. The first interface 11 and the second interface 12 are arranged opposite to each other.

[0061] The protection component 30 is located between the first interface 11 and the second interface 12 .

[0062] In this embodiment, the first predetermined direction S1 can be one of the length or width of the base 10. If the first predetermined direction S1 is the length of the base 10, the first sidewall 14 and the second sidewall 15 can be the front and rear sidewalls of the base 10, respectively. If the first predetermined direction S1 is the width of the base 10, the first sidewall 14 and the second sidewall 15 can be the left and right sidewalls of the base 10, respectively. In this embodiment, the axis of the first interface 11 can overlap with the axis of the second interface 12, thereby achieving a facing arrangement of the two.

[0063] exist Figures 1 to 6 In the illustrated embodiment, the protective component 30 can be arranged between the first interface 11 and the second interface 12 on the heat dissipation cover 20; the first end of the protective component 30 can be arranged to face the first interface 11, and the second end can be arranged to face the second interface 12, so that the protective component 30 can be electrically connected to the first connector 111 and the second connector 121 respectively.

[0064] Optionally, the base 10 further has a third side wall 16 and a fourth side wall 17 opposite to each other in a second preset direction S2, and the second preset direction S2 is perpendicular to the first preset direction S1;

[0065] A first fixing portion 40 is provided on the outer side of the third side wall 16 , and a second fixing portion 50 is provided on the outer side surface of the fourth side wall 17 .

[0066] In this embodiment, the second predetermined direction S2 may be the other of the length direction and the width direction of the base 10. Thus, if the first side wall 14 and the second side wall 15 are the front side wall and the rear side wall of the base 10, respectively, then the third side wall 16 and the fourth side wall 17 may be the left side wall and the right side wall of the base 10, respectively; if the first side wall 14 and the second side wall 15 are the left side wall and the right side wall of the base 10, respectively, then the third side wall 16 and the fourth side wall 17 may be the front side wall and the rear side wall of the base 10, respectively.

[0067] The first fixing portion 40 and the second fixing portion 50 are used for the base 10 to be installed on a corresponding target object (such as a bracket or a wall), thereby achieving the installation of the short-circuit protection component.

[0068] Optionally, refer to Figure 5 , the base 10 also has a bottom end 18 facing the heat dissipation cover plate 20;

[0069] The first fixing portion 40 and the second fixing portion 50 are respectively flush with the outer side surface of the bottom end 18 .

[0070] In this embodiment, the bottom end 18 is the end opposite to the heat dissipation cover plate 20 in the accommodating cavity, and the outer end of the bottom end 18 is the side end facing away from the accommodating cavity. The first fixing portion 40 and the second fixing portion 50 are both arranged on the third side wall 16 and the fourth side wall 17 away from the heat dissipation cover plate 20. The first fixing portion 40 and the second fixing portion 50 both have a lower side facing the same direction as the outer side of the bottom surface. In this embodiment, the lower side of the first fixing portion 40 and the second fixing portion 50 are in the same plane as the outer side of the bottom surface. Figure 5 In the illustrated embodiment, the first fixing portion 40 and the second fixing portion 50 are integrally formed with the base 10, and an opening is respectively provided on the first fixing portion 40 and the second fixing portion 50, through which fixing members such as screws can pass, thereby achieving a stable installation of the short-circuit protection component on the target object.

[0071] Optionally, refer to Figure 4 , the number of the first interface 11, the second interface 12, and the protection component 30 are all multiple;

[0072] All the first interfaces 11 are provided on the first side wall 14 and are arranged sequentially along the second preset direction S2; each of the first interfaces 11 is sealed with a first connector 111 for electrically connecting to the negative electrode of the photovoltaic module;

[0073] All the second interfaces 12 are provided on the second side wall 15 and are arranged in sequence along the second preset direction S2; each of the second interfaces 12 is sealed and provided with a second connector 121 for electrically connecting to the negative input terminal of the inverter;

[0074] All the protection components 30 are respectively in contact with the heat dissipation cover plate 20; the first ends of the plurality of protection components 30 are electrically connected to the plurality of first connectors 111 in a one-to-one manner, and the second ends of the plurality of protection components 30 are electrically connected to the plurality of second connectors 121 in a one-to-one manner;

[0075] All the first interfaces 11 are respectively arranged opposite to different second interfaces 12 , and each of the protection components 30 is arranged between the connected first connector 111 and the second connector 121 .

[0076] In this embodiment, the first interface 11, the second interface 12 and the protection component 30 can be specifically configured according to actual needs and are not limited thereto; Figure 4The illustrated embodiment shows a case where the number is three. In this case, the heat dissipation cover plate 20 is used to dissipate heat for all protective components 30. Furthermore, it should be noted that the photovoltaic components connected to each first connector 111 are different photovoltaic components, but the inverters connected to each second connector 121 can be the negative input terminals of different inverters (in this case, the inverter is a single-input inverter) or different negative input terminals of a single inverter (in this case, the inverter is a multi-input inverter), and this is not limited in this application.

[0077] The technical solution of the present invention can simultaneously achieve ground short-circuit protection for multiple photovoltaic components by arranging multiple protection components 30 in the sealed cavity, which is beneficial to improving the integration. In addition, each first interface 11 is directly opposite to the corresponding second interface 12, which is convenient for comparison during wiring and is beneficial to reducing the error rate of wiring.

[0078] Reference Figures 5 and 6 In one embodiment, the short circuit protection component includes:

[0079] The first heat exchange component 60 is sandwiched between the protection component 30 and the heat dissipation cover plate 20 .

[0080] The first heat exchange member 60 can be implemented by a ceramic gasket or heat dissipation silica gel. The first heat exchange member 60 is used to increase the heat dissipation efficiency between the protection assembly 30 and the heat dissipation cover plate 20.

[0081] Optionally, a projected area of ​​the first heat exchange element 60 on the heat dissipation cover plate 20 is larger than a projected area of ​​the protection component 30 on the heat dissipation cover plate 20 .

[0082] In this way, the contact area between the first heat exchange element 60 and the heat dissipation cover plate 20 can be increased, thereby improving the heat dissipation efficiency of the protection component 30 .

[0083] When there are multiple protection components 30 , the projected area of ​​the first heat exchanger 60 on the heat dissipation cover plate 20 is larger than the projected areas of all protection components 30 on the heat dissipation cover plate 20 , thereby ensuring that the heat dissipation efficiency of all protection components 30 can be increased.

[0084] Optionally, the short-circuit protection component includes:

[0085] The buckle 70 has a first end and a second end relative to each other. The first end of the buckle 70 is connected to the heat dissipation cover 20, and the second end of the buckle 70 is connected to an extension portion 73. The extension portion 73 forms a snap-fit ​​space, and the protection component 30 is snap-fitted into the snap-fit ​​space.

[0086] In this embodiment, the second end of the buckle 70 can extend toward the ground of the base 10, and the buckle 70 as a whole can be nearly "L"-shaped. The buckle 70 is used to fix the protective component 30 to the inner side surface of the heat dissipation cover 20. The extension portion 73 of the buckle 70 can form a spacing space with the inner side surface of the heat dissipation cover 20. The edge of the extension portion 73 can extend toward the heat dissipation cover 20 with multiple clips to form a clip space. The overall shape of the clip space can be adapted to the outer shape of the protective component 30 so that the protective component 30 can be installed in the clip space. In addition, since the buckle 70 abuts against the protective component 30, the protective component 30 can also dissipate heat through the buckle 70.

[0087] Optionally, refer to Figure 6 The buckle 70 is provided with a second heat exchange component 74 .

[0088] The second heat exchange member 74 can also be implemented by ceramic gaskets or heat dissipation silica gel. The second heat exchange member 74 is used to accelerate the heat dissipation efficiency between the protection component 30 and the buckle 70, so that the buckle 70 can better dissipate heat from the protection component 30.

[0089] The present utility model also provides a photovoltaic inverter system, which includes a photovoltaic module, an inverter and a short-circuit protection module. The specific structure of the short-circuit protection module refers to the above embodiment. Since the photovoltaic inverter system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described one by one here.

[0090] The short-circuit protection component is connected to the negative pole of the photovoltaic component and the negative input terminal of the short-circuit protection component respectively.

[0091] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A short circuit protection component, characterized in that: The short circuit protection component includes: A base, the base having a first interface, a second interface, and an opening, the first interface being sealed with a first connector for electrically connecting to the negative pole of the photovoltaic module, and the second interface being sealed with a second connector for electrically connecting to the negative input terminal of the inverter; a heat dissipation cover plate, covering the opening and sealingly connected to the base to form a sealed cavity; A protection component is arranged in the sealed cavity and abuts against the heat dissipation cover; the first end and the second end of the protection component are electrically connected to the first connector and the second connector one-to-one, and the current direction of the protection component is from the second end to the first end.

2. The short circuit protection assembly according to claim 1, wherein: The base has a first side wall and a second side wall that are opposite to each other in a first preset direction, the first interface is provided on the first side wall, the second interface is provided on the second side wall, and the first interface and the second interface are arranged opposite each other; The protection component is located between the first interface and the second interface.

3. The short circuit protection assembly according to claim 2, wherein: The base further has a third side wall and a fourth side wall opposite to each other in a second preset direction, wherein the second preset direction is perpendicular to the first preset direction; A first fixing portion is provided on the outer side of the third side wall, and a second fixing portion is provided on the outer side surface of the fourth side wall.

4. The short circuit protection assembly according to claim 3, wherein: The base also has a bottom end facing the heat dissipation cover plate; The first fixing portion and the second fixing portion are respectively flush with the outer side surface of the bottom end.

5. The short circuit protection assembly according to claim 3, wherein: The number of the first interface, the second interface, and the protection component is multiple; All the first interfaces are provided on the first side wall and are arranged sequentially along the second preset direction; each of the first interfaces is sealed with a first connector for electrically connecting to the negative pole of the photovoltaic module; All the second interfaces are provided on the second side wall and are arranged in sequence along the second preset direction; each second interface seal is provided with a second connector for electrically connecting to the negative input terminal of the inverter; All the protection components are respectively in contact with the heat dissipation cover plate; the first ends of the plurality of protection components are electrically connected to the plurality of first connectors in a one-to-one manner, and the second ends of the plurality of protection components are electrically connected to the plurality of second connectors in a one-to-one manner; All the first interfaces are respectively arranged opposite to different second interfaces, and each of the protection components is arranged between the connected first connector and the second connector.

6. The short-circuit protection assembly according to any one of claims 1 to 5, characterized in that: The short circuit protection component includes: A first heat exchange component is sandwiched between the protection component and the heat dissipation cover plate.

7. The short circuit protection assembly according to claim 6, wherein: The projected area of ​​the first heat exchange element on the heat dissipation cover plate is larger than the projected area of ​​the protection component on the heat dissipation cover plate.

8. The short circuit protection assembly according to claim 1, wherein: The short circuit protection component includes: The buckle has a first end and a second end opposite to each other, the first end of the buckle is connected to the heat dissipation cover plate, the second end of the buckle is connected to an extension portion, the extension portion forms a snap-fit ​​space, and the protection component is snap-fitted into the snap-fit ​​space.

9. The short circuit protection assembly according to claim 8, wherein: A second heat exchange component is provided in the buckle.

10. A photovoltaic inverter system, characterized in that: The photovoltaic inverter system includes: Photovoltaic panels; inverter; and, The short-circuit protection component according to any one of claims 1 to 9, wherein the short-circuit protection component is connected to the negative electrode of the photovoltaic component and the negative input terminal of the short-circuit protection component respectively.

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